AliNeutralMesonSelection: Set default settings for pi0 or eta pairs selection, set...

AliNeutralMesonSelection: Set default settings for pi0 or eta pairs selection, set via setter
                                            For EMCAL, variable maximum invariant mass cut with energy to account for increase of mass value due to merging.
                                            Remove pt histogram settings since all histograms are with E

AliAnaPi0EbE: Add shower shape histograms to check modules without TRD and cut on fraction of energy carried by cell with maximum energy.